Evaluating process safety at conceptual stage: A stream-based index approach
Bibliographic record
Abstract
Incorporating safety indexes during the conceptual design stage is essential for ensuring the safety and efficiency of chemical processes. Despite many advances in the field, there are still areas that can be improved. Here we present a new Stream Safety Index: a fully automated, stream-based safety index coupled with a process simulator. The index ranges over a simple scale from 0 to 10 and provides immediate feedback on safety performance, facilitating safer design decisions. It is constructed starting from various sub-indexes, based on continuous, optimized functions. The index is tested on a methanol production process flowsheet and compared to two existing indexes, Process Stream Index (PSI) and Comprehensive Inherent Safety Index (CISI). Stream Safety Index (SSI) identifies the same sensitive zones as CISI, but its calculation is automatized and almost instantaneous. While Stream Safety Index does not completely eliminate subjectivity, it can be easily adapted to fit the specific parameters of the end user.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".